Display or indicating device

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

Reexamination Certificate

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Details

C345S110000, C345S111000, C345S076000

Reexamination Certificate

active

06229517

ABSTRACT:

The present invention relates to a display or indicating device having display units which display the picture to be reproduced in a dot-by-dot manner, the respective display unit comprising a display dot as well as means for actuating said display dot.
Such a display or indicating device is already known. The dot of the respective display unit has a baseplate. The mutually opposite large areas of said baseplate have a high color contrast. One of the large areas of the baseplate is black, while the other large area is yellow, for example. The baseplate carries a permanent magnet. The display unit furthermore comprises a controllable magnetic circuit having an approximately U-shaped yoke. The dot plate is assigned to the poles of this yoke which, together with the permanent magnet, enables the display dot to be adjusted. This display or indicating device furthermore comprises a light source which is placed in front of the dots of the display units and is permanently in operation, if required. If nothing is to be displayed, then the black side of all the display dots faces the viewer. In order to display a picture, those display units which are to be involved in the display of the picture are driven. In the case of these units, the display dot is rotated such that its yellow side faces the viewer. The yellow surface of the display dot reflects the light from the light source to the viewer.
This previously known display or indicating device must be arranged relative to the viewer in such a way that the light source which is placed in front of the display units does not dazzle the viewer. As a rule, the display units form horizontal rows lying one above the other. The light source is usually arranged underneath the panel of display units and at a specific distance in front of said panel. In this case, the display dots of the lower rows appear to be brighter than the display dots of the upper rows, which adversely affects the reading of the information that is to be communicated by such a device. Owing to the light source and owing to the necessity of arranging the latter at a distance in front of the display panel, such display or indicating devices have considerable dimensions which cannot be reduced in this system of display.
The object of the present invention is to eliminate the abovementioned disadvantages and also still further disadvantages of the prior art.
In the case of the device of the generic type mentioned in the introduction, this object is achieved according to the invention in the manner defined in the characterizing part of patent claim
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REFERENCES:
patent: 4074253 (1978-02-01), Nadir
patent: 4531318 (1985-07-01), Chang et al.
patent: 4794391 (1988-12-01), Costa et al.
patent: 6025825 (2000-02-01), Kao
patent: 0291122 (1988-11-01), None
patent: 2543336 (1984-09-01), None
patent: 8706047 (1987-10-01), None

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